Patent GB-1029465-A (GB)
Title: Phosphorus containing polyether polyols
Inventor: LUTZ MARTIN ROBERT
IPC: C08G18/50
Filed: 1964-07-03
Abstract: A phosphorus-containing polyether polyol comprises the reaction product of (a) the product formed by the esterification of (1) polyphosphoric acid containing 3 to 13% P2O5 in excess of the amount which provides 100% H3PO4 with (2) a polyol which is a polyhydroxyalkane containing from 3 to 6 hydroxyl groups, a carbohydrate containing from 5 to 8 hydroxyl groups or a mixture thereof, the polyol moiety being present in an amount of from 2 to 4 moles for each mole of P2O5 in excess of the amount which provides 100% H3PO4 and (b) an alkylene oxide containing from 2 to 4 carbon atoms, the alkylene oxide being present in an amount sufficient to neutralize all phosphoric acid groups, but less than the amount which lowers the hydroxyl number of the reaction product below 200. Suitable polyols are glycerol, trimethylolethane, trimethylolpropane, 1,2,6-hexanetriol, pentaerythritol, sorbitol, sucrose or dextrose and suitable alkylene oxides are 1,2-propylene oxide, epichlorohydrin and 1,2-butene oxide.  A preferred class of polyisocyanates are chlorinated aromatic diisocyanates which contain at least 25% chlorine especially chlorinated m-phenylene diisocyanates, a 39% chlorine containing blend of which may be obtained by blending equal amounts of tetrachloro-, trichloro-, and dichloro-m-phenylene diisocyanates.  The polyurethanes are generally prepared by forming a prepolymer containing free isocyanate groups which are then reacted with additional polyol. Examples are given for the production of polyurethane foams using trichlorofluoromethane and blowing agent. Water and other fluorinated hydrocarbons may also be used as blowing agents.ALSO:Polyurethanes and polyurethane foams may be prepared by reacting an aromatic polyisocyanate with a phosphorus-containing polyether polyol comprising the reaction product of (a) the product formed by the esterification of (1) polyphosphoric acid containing 3 to 13% P2O5 in excess of the amount which provides 100% H3PO4 with (2) a polyol which is a poly-hydroxyalkane containing from 3 to 6 hydroxyl groups, a carbohydrate containing from 5 to 8 hydroxyl groups or a mixture thereof, the polyol moiety being present in an amount of from 2 to 4 moles for each mole of P2O5 in excess of the amount which provides 100% H3PO4 and (b) an alkylene oxide containing from 2 to 4 carbon atoms, the alkylene oxide being present in an amount sufficient to neutralize all phosphoric acid groups, but less than the amount which lowers the hydroxy number of the reaction product below 200.  Suitable polyols are glycerol, trimethylolethane, trimethylpropane, 1,2,6-hexanetriol, pentaethritol, sorbitol, sucrose or dextrose and suitable alkylene oxides are ethylene oxide, ethylene oxide, 1,2-propylene oxide, epichlorohydrin and 1,2-butene oxide.  In the examples, a solvent such as dioxane or a previously prepared phosphorus containing polyether polyol is used.  The phosphorus-containing polyether polyols may be reacted with polyisocyanates and impart flame-proofing properties to the polyurethanes and polyurethane foams thereby produced (see Division C3).